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Real Estate Assets (Summary of Properties Owned) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned		$ 234,534	$ 240,522
Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Mar. 01, 2007
Location		Colorado Springs, Colorado
Real Estate Assets Owned		$ 11,434	11,656
World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	[1]	Sep. 01, 2007
Location	[1]	San Bernardino, California
Real Estate Assets Owned	[1]	$ 5,743	5,750
Regatta Square [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Oct. 01, 2007
Location		Denver, Colorado
Real Estate Assets Owned			1,836
Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Jul. 01, 2008
Location		Colorado Springs, Colorado
Real Estate Assets Owned		$ 8,076	8,125
Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2008
Location		San Bernardino, California
Real Estate Assets Owned		$ 5,624	5,753
Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Sep. 01, 2008
Location		Escondido, California
Real Estate Assets Owned		$ 4,040	4,146
Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Jan. 01, 2009
Location		San Diego, California
Real Estate Assets Owned		$ 4,870	5,079
Dakota Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		May 01, 2011
Location		Fargo, North Dakota
Real Estate Assets Owned		$ 9,635	10,148
Rangewood Medical Office Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Mar. 01, 2009
Location		Colorado Springs, Colorado
Real Estate Assets Owned			2,054
Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2010
Location		San Diego, California
Real Estate Assets Owned		$ 8,609	8,670
Grand Pacific Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Mar. 01, 2014
Location		Bismarck, ND
Real Estate Assets Owned		$ 5,854	5,392
Yucca Valley Retail Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	[1]	Sep. 01, 2011
Location	[1]	Yucca Valley, California
Real Estate Assets Owned	[1]	$ 6,605	6,738
Port of San Diego Complex [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Dec. 01, 2011
Location		San Diego, California
Real Estate Assets Owned		$ 13,888	14,153
Shoreline Medical Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		May 01, 2012
Location		Half Moon Bay, California
Real Estate Assets Owned			5,821
The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Nov. 01, 2012
Location		Aurora, Colorado
Real Estate Assets Owned		$ 6,415	6,609
West Fargo Industrial [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2015
Location		Fargo, North Dakota
Real Estate Assets Owned		$ 7,455	7,632
300 N.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2015
Location		Fargo, North Dakota
Real Estate Assets Owned		$ 3,636	3,751
One Park Centre [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2015
Location		Westminster, Colorado
Real Estate Assets Owned		$ 8,514	8,515
Union Terrace [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2014
Location		Lakewood, Colorado
Real Estate Assets Owned		$ 8,287	8,276
Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Dec. 01, 2014
Location		Colorado Springs, Colorado
Real Estate Assets Owned		$ 13,431	14,157
Highland Court [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2015
Location		Centennial, Colorado
Real Estate Assets Owned		$ 12,287	12,511
Arapahoe Service Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Dec. 01, 2014
Location		Centennial, Colorado
Real Estate Assets Owned		$ 10,638	11,207
Shea Center II [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Dec. 01, 2015
Location		Highlands Ranch, Colorado
Real Estate Assets Owned		$ 23,352	24,409
Office/Industrial Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned		$ 191,288	205,708
Union Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Dec. 01, 2014
Location		Colorado Springs, Colorado
Real Estate Assets Owned		$ 10,209	10,544
Research Parkway [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Aug. 01, 2015
Location		Colorado Springs, Colorado
Real Estate Assets Owned		$ 2,686	2,776
Model Home Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned		$ 43,246	$ 34,814
Model Home Properties [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Jan. 01, 2011
Model Home Properties [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired		Jan. 01, 2017
[1] Properties held for sale as of December 31, 2017

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule III)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
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